Burglar-alarm.



No. 675,570. Patented June 4, 190i. J. W. ROSENGREN.

BUBGLAB ALARM.

(Application filed Apr. 2, M301.)

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(No Model.)

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UNTTEb STATES PATENT OEEIcE.

JOHN IV. ROSENGREN, OF HYDE PARK, MASSACHUSETTS.

BURG LAB-ALARM.

SL EGIFIGATION forming part of Letters Patent No. 675,570, dated June 4,1901.

Application filed April 2, 1901.

To aZZ whom it may concern:

Be it known that I, JoHN W. RosENoREN, a citizen of the United States,residing at Hyde Park, in the county of Norfolk and State ofMassachusetts, have invented newand useful Improvements inBurglar-Alarms, of which the following is a specification.

This invention relates to improvements in burglar-alarms adapted for useon doors or windows, &c., for the purpose of automatically causing analarm to be sounded in case burglars or other unauthorized personsshould attempt to gain entrance to the premises through the doors orwindows, &c., as will hereinafter be more fully shown and described,reference being bad to the accompanying drawings, wherein- Figure 1represents a front elevation of my improved burglar-alarm shown asapplied to a door. Fig. 2 represents a top plan View of Fig. 1. Fig. 3represents a detail top plan View of the device shown as detached fromthe door. Fig. represents a section on'the line at at shown in Fig. 3.Fig. 5 represents a cross-section on the line 5 5 shown in Fig. 4, andFig. 6 represents a cross-section on the line 6 6 shown in Fig.

Similar letters refer to similar parts Wherever they occur on thediderent parts of the drawings.

In Figs. 1 and 2, A represents the door, hinged to the casing B, asusual.

0 represents a block or casing of wood or metal secured in a suitablemanner to the casing B. In a cavity in the said block is pivoted upon apin D a hammer E, provided with a projection e, as shown in Figs. 4 and5. Said hammer is normally held in the position shown in Fig. 4 by theinfluence of a suitable spring F. (Shownin said Fig. at.) The head ofsaid hammer is normally held against a yielding spring-pressed pin G,the lower end of which rests upon a yielding spring-pressed pin H,arranged in a perforated metal block I, which is pivoted on a pin K,secured in the block or casing O, as shown in Figs. 4 and 6. The block Iis supported upon a cartridgeholder L, which contains an explosivecartridge M. (Shown in Fig. 4.) The said car- Serial No. 54,039. (Nomodel.)

i tridge-holder is pivotally arranged upon the same pin K on which theblock I is pivoted.

O is a perforation in the casing 0, below the cartridge M, to allow thegases from the cartridge to escape when the latter is ex ploded.

For the purpose of charging the holder L with a cartridge or extractingthe shell after being fired it is only necessary to swing thebydottedlines in Fig. 6. After the cartridgeholder has been charged itand the block I are swung to the normal position shown in full lines inFigs. 4 and 6.

Nis a cover hinged to the front of the block or casing O, and it servesthe purpose of inclosing the internal mechanism of the parts arrangedwithin the said block or casing, as shown. On top ofthe said block orcasing C is arranged a longitudinally-movable plate 0, which ispreferably guided on said block by means of screws P P, passing looselythrough slots 0 O in the plate 0 and screwed or 0therwise firmly securedto the block 0, as shown.

To the movable plate 0 is pivoted at q the trigger Q, which is receivedin a slot ()"in the plate 0, as shown in Figs. 3 and 4.

Intermediate between the under side of the plate 0 and the upper portionof the trigger Q is placed a stop-gate R, which is preferably arrangedadjustable in a groove in the upper portion of said trigger, as shown inFigs. 3 and 4.

In setting the device for giving an alarm I insert the stop'gate Rbetween the trigger and under side of slide 0, so as to prevent thetriggerfrom yielding when brought in contact with the projection e onthe hammer E during the movement of the plate 0 in the direction of thearrow shown in Figs. 3 and 4.

S is a preferably knee-lever pivoted at P to the top of the block orcasing O and pivotally connected, by means ofa link '1, to the slide 0,as shown.

To the outer free end of the lever S is preferably journaled a roller S,adapted to lie in contact with the door A, as shown in Figs. 1 1 and 2.

parts I and L outward to the position shown During the day-time or whenit is desired not to use the alarm I remove the stop-gate B, so as topermit the door to be swung open whenever {so desired without actuatingthe trigger Q and hammer E.

To set the device for operation after the door has been closed andlocked, I open the cover N and swing the pin-block I andcartridge-holderLoutward to the position shown in dotted lines in Fig.6, after which I place a. blank cartridge in the holder L and swing thepartsI L to their normal positions, (shown in full lihes in Figs. 4 and6,) after which I close the cover N, as shown in Figs. 4, 5, and 6. Ifthe door should now be opened, the lever Swill be actuated by the doorand caused to swing on the fulcrum P in the direction of the arrow shownin Fig. 2, and thereby causing the plate 0 to move in the direction ofthe arrow shown in Figs. 3 and 4E, and in so doing the trigger Q iscaused to come in contact with the projection e on the hammer E,causingthe latterto be swung againstthe influence of its spring F in thedirection of the arrow shown in Fig. 4 until the trigger has passed bysaid projection 6, when the hammer is liberated and caused by theinfluence of its spring F to strike the pin G, which when striking thepin H causes the cartridge M to be exploded with greatnoise, therebyawakening and alarming the occupants of the house.

In practice I prefer to arrange back of the pin-block I a spring-pressedbolt U, which is longitudinally adjustable in a cavity in the casing Oand normally held by the spring V in the position shown in Fig. 6. Theinner end of said bolt U is inclined at U in Fig. 6.

The block I may be swung outward when so desired simply by pressing thebolt U inward in contact with the free end of the block I.

The invention is very simple in construction, is very effective in itsoperation, and may be used in connection with doors, windows, gates,&c., for the purpose hereinabove set forth.

What I wish to' secure by Letters Patent and claim is- A burglar-alarm,consisting in combination, a box or casing, secured to the doorframe andhaving a spring-actuated hammer arranged within it a pin-block andcartridgeholder pivotally arranged within said casing below the hammer,a sliding plate and a trig ger pivotally arranged thereon, a door-leverpivoted to said casing and to a link connected to the trigger-carryingslide substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

JOHN \V. ROSENGRENV \Vitnesses:

ALBAN ANDREN, RICHARD O. ULBRICH.

